Roller bearing for clutch motors



Aug. 16, 1927.

Fig.1 7

R. PRUGER 2 Sheets-Shoot 1 j a a I I as 6 v; f 3

f7 .Z 7 X I f g 1 Z y I, (I! I INVENTOR- fiaou/ Prayer g 2 BE 2 ATTORNEY Aug. 16, 1927.

R. PRUGER 2 Sheets-Sheet 2 x .36 35 I 5/1 p "iii .24 11L: /74/ /0 42- 20 WITNESSES: INVENTOR ATTORNEY I} roller" bearings o 1I'mountin i trolled. The 0 I sitates frequent fillings in order to mamtam I b arings but it eflectually prevents the Patented Aug. 1a, 192?.

V-UNI'TEDSTATES mounjrnuana, or near Lmxa'rr, rmmv'ama, assrenon ro was'rmsnousn nac'rmca mac-roams coirranr, a coaroaarrox or rmmvana.

noun name roa cnu'rcn xo'rona Application me awn 1m. mm x. m,

My invention relates to oil-lubricated .rolle'rbearings for an p0 bers on station sha and it haspartlcular relation to e ectric motor having their I rotor members operable, at t mes, to rotatefreely on the dnvin shafts without transmitting torque to loa devices which are connected to the shafts, the rotor members'being supported on roller bearings which must not be permitted to leak oil on acwunt of the very deleterious efiect of the oil on the operative parts of the electric motors.

- An object of m invention is to provide I an im roved type, for

arotating mem upon a'stationary packed type oil, the leaks ofoil hasbeen poorly conutilization j of the 116811118 m an electric motor, wherein the leakage of on mm the '25 windings and ventilating ducts'cannot be tolerated.

The developmen t of chronous-lelutch motors has for a long time for'wantof. really bearings for so rotatably rotor members on ..theirshafta.;- m

- With the feregoing'andother objectsm vview, m -invent1on eonsists in the details and co inationshereinafter described and he claimed and illustrated the accompanying Fig drawing, wherein- Fig. 1 is a longitudinal section view of the to half of a synchronous clutch motor em m invention,

a 1 'tudinal sectional detail 7 view of the hub o the rotor spider Fig. 3 is an end elevation of the struc ture shown in Fig.2,and

Fig. 4 is a sectional detail view of one as of the bearings,

As shown in the drawings, m invention is applied to a synchronous clutc motorcomusing a stator member 1 and a rotor memr 2, the latter'comprising the field member so of the synchronous motor. The hub 3 of the rotor member is loosely mounted upon the driving shaft 4 of the motor, mid shaft being supported in stationary bearings 15 and 6. The rotor member 3 mag be mechanically connectedto the driving s rotor memaft. Such bearings have hereto-" age of oil not only neces-- aft, at any time,

with a recess 9 for recei t e outer race 10 of a roller bearing comprising a lplurality rollers of cylindrical, spherical or conic 12. The inner race 13 of each roller bearing is carried by the shaft. i

As shown in detail in Fig.- 4, the inner race 13 of the roller bearing is held, in place, against the shoulder 14 on the shaftfl means of a lock nut 15, and a second 1 nut 16 is also provided in engagement with "(0 the first lock nut, the second nut being provided with a radial flange 17 having a smooth plane back surface 18 facing away from the roller bearing.

A hearing housingecag 20 is secured to 1 5; thejrotor hub mem r and is provided with a machined recess 21 having a radial lane surface22 spaced a capillary mm the cor ndin surface 18 of the lock nut 16 on e sha t. The housing cap 20 is provided also with an annular races, 23 having a wall 24"which is preferably flared outwardly from the recess 21 and terminates at the edge of the outer race 10 of the bearin A thrust co ar 25 of self lubricating construction, such as a cast-iron collar provided with graphite plu is disposed between a spacer 26, whic is ocked to the flan lock nut' 16, as well as being keyed to t e shaft a 4 and a closing cap. 27 which is secured to the housing ca 20. The housing cap 20 is bored to receive the thrust collar 25 and the spacer 26 and may be provided with the usual oil-catching grooves 29 for catching an oil which may leak that far out of the re] er bearing.

When the rotor member is stationary, the oil level 31, as shown in Fig. 4, is such that the-oil is retained, without overflow, in the bottom of the annular chamber which is bounded, on one side, by the recess 9 in the rotor member and, on the other side, by the outer race 10 of the roller bearing and the recess of cavity 21 of the housing'cap 20. i

Suitable filling means are provided, comprising filling ducts or holes 32, 33, 34 and 35, feeding into- 36 in the side of. each of the outer races 9 of the hub member The rotor hub a is provid a each end, so

' closed, and the overflow oil may be wi ed off the rotor member at a readily access1 le point without causing any overflow 'within the bearings themselves.

The synchronous clutch motor to which my improved bearing is applied is designed not only to operate with its rotor member I erate continuousl for indefinitelyx 1on5 pe- ,riods of times, w en the load is s ut o freely rotatin on the shaft during the starting perio necessary to bring the' rotor member up to synchronous speed with the load detached, but it is also designed to opto "supply power-factor correcting currents as a synchronous condenser. Hence, it is necesary for the roller bearings to be designed not merely for intermittent starting service but for a continuous operation. When the rotor member is rotating, carrying with it the outer race 10 and the hous ing cap 20, the oil is thrown out by centrifugal force to the outer periphery of the annular chamber limited by the outer race 10 and the flaring surface 24 of the cavity in the housing cap, as indicated by the oil level 41 in Fig. 4. I Preferably, the level 41 of the rotating oil is such that the radial flangeil'? of the lock nut 16 onthe shaft does not dip into the oil during rotation, but this is not absoluteessential, as any oil which may get into I the space between the two radial flange surfaces 18 and 22 will be thrown out bythe combined actions of centrifugal force and capillary action.

The flared surface 24 of the recess in the housing cap 20 serves to feed'the oil. continuously by centrifugal-action, to the outer I While race of the roller bearing, thus insuring a copious supply of oil for the rollers 12 at all times. p I

When the motor comes to rest, the -oil clinging to the periphery of the flared sur-;

face 24 gradually recedes, an annular groove 42 being provided in said-flared surface, at

a point a outio posite to the inner face of the nut-flange 1 forthe purpose of cansing the oil to drip off into the oil chamber of the bearing instead of dripping off into the capillary space 18, 21 outside of the bearing.

I'have described my invention a preferred embodiment, it is obvious that many'alterations and modifications m a be adopted by those skilled in the art wit out shaft and a rotor member rotatablfi' Ifecess' havin a caplllzgfiy departing from the s iritand scope of my invention; I desire. therefore, that the appended claims shall be accorded the broad est interpretationconsistent with their language and the prior art. v

I claim as 'myinvention; '1. The combination with ,a stationary shaft-and a rotor member rotatabl mount 4 r 7 ed thereon, ofan oil-lubricated ro ler bearing comprising inner. and outer races supported by's'aid shaft and said rotor member,

respectively, and a housing, member carried bysaid rotor member in. juxtaposition-to.

said outer race and having'a'flaring annular cavity openingontolsaid outer race, the lubricating'oil being of such quantit as to be retained, without overflow,- in t hottom of the annular chamber provided by i said rotor member, said outer raceand the cavity of said. housing member when the rotor is at rest, the oil being thrown to the.

outer rotor is rotatin and being maintained in said outer race the flaring shape of said cavity and the e ect of centrifugal force.

2. The vcombination with a stationary mounted thereon, of an oil-lubricated r0 ing comprising inner and outer races supported by said shaft and said rotor member, respectively, a radially flanged member surrounding said shaft adjacent to said inner periphery of said chamber when the f or bearrace, the flange of said member bein pro-j vided with .a lane radial surface away from sai bearing, a housing member of said shaft andsaidrotor member, sai housing member being a plane radia surface 8 need lane r ial surface, said. housin 'eing also provided with an annu ar cavity opening from said recess onto saidouter race, the lubricating oil being of such quantity as to be retained, withoutoverflow, in

thebottom of the annular chamber pro-' vided by said rotor member, said outer race and the cavity and. recess of said housing member when the rotor is at rest, the oil being-thrown to the outer periphery of said chamber when the'rotor is rotating and be-. iitiig maintained in said outer race by the e co t of. centrifugal force.

3. The combination with a] stationary shaft and a rotor member rotatably mounted thereon, of. an oil-lubricated roller bearing rovided with a acing carried by said rotor-member, and thrust bparing means" for preventing relative end a comprising inner and outerraces supported l by said shaft and said rotor member, respectively, a radially-flanged member surrounding said shaft ad'acent to said inner rac the flange of said member being provide with a plane radial surface facinge away from said bearing, a housing mem r carried by said rotor member, and thrust-bear- 10 lstancefrom the first-mentioned member ing means for preventing relative end play of said shaftand said rotor member, said housing member being provided with a recess having a plane radial face spaced a capillary distance from the first-mentioned plane radial surface, said housing member being also provided with a flaring annular cavity opening from said recess onto' said outer race, the lubricating oil being of such quantity as to be retained, without overflow, in the bottom of the annular chamber provided by said rotor member, said outer race and the c vity and recess of said housing member whe the rotor is at rest, the oil being thrown to the outer periphery of said chamber when the rotor is rotating and being maintained in said outer race by the flaring shape of said cavity and the efl'ect of centrifugal force.

4. The combination with a stationary shaft and a rotor member rotatably mounted thereon, of an oil-lubricated roller bearing comprism inner and outer races su porte by said s aft and said rotor mem er, re-

spectively, a radially flanged member surrounding said shaft adjacent to said inner race, a housing member carried by said rotor ,member, and thrust-bearing means. for preventing relative end play of said shaft and said rotor member, said housing member having a recess and a flaring annular cavity opening from said recess onto said outer race, the flarin surface of said cavity haw 7 ing an oil-she ding means disposed adjacent to the inner surface of the radial flange of the shaft-carried member.

5. The combination with a stationary shaft member when the rotoris at rest, the oil being thrown to the outer periphery of said chamber when the rotor is rotating and bei maintained in said outer race by the effect of centrifu al force, and means for adding oil to said bearing when the rotor member is stationary, said means com rising a pipe terminating in a filling plug aving means for preventing the accumulation of an excessive quantity of oil in the bearing. In testimony whereof, I have hereunto iubscribed my name this 28th day of July,

RAOUL PRUGER.

:outer race and the cavity of said housing 

